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Nikon DSLR Cameras
D3100
AF Area Mode
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<blockquote data-quote="Mike D90" data-source="post: 287913" data-attributes="member: 17556"><p>When tracking a fast moving object such as a runner or race car, or flying bird even, you will usually be using a high shutter speed to stop movement. This means you may also need to use a wider aperture so you can achieve the necessary exposure. When you do that you have narrow depth of field. Since you have narrow depth of field you need to assure that you focus exactly where you need focus, the eyes for example or face, or your image will be out of focus in the key areas. Using single point area with AF-C allows you to pinpoint the focus area and it won't suddenly jump to another area of movement, such as another runners arms or legs, and you miss your focus.</p><p></p><p>That is why I don't use dynamic tracking with moving/flying birds. Any movement of the background, such as tree limbs or other birds in the air, will cause auto focus to move from the subject I want in focus. Focus works by comparing contrast. Birds that contrast against a wooded background can easily be lost to the difference in contrast of the wooded branches that may also be moving in the wind.</p></blockquote><p></p>
[QUOTE="Mike D90, post: 287913, member: 17556"] When tracking a fast moving object such as a runner or race car, or flying bird even, you will usually be using a high shutter speed to stop movement. This means you may also need to use a wider aperture so you can achieve the necessary exposure. When you do that you have narrow depth of field. Since you have narrow depth of field you need to assure that you focus exactly where you need focus, the eyes for example or face, or your image will be out of focus in the key areas. Using single point area with AF-C allows you to pinpoint the focus area and it won't suddenly jump to another area of movement, such as another runners arms or legs, and you miss your focus. That is why I don't use dynamic tracking with moving/flying birds. Any movement of the background, such as tree limbs or other birds in the air, will cause auto focus to move from the subject I want in focus. Focus works by comparing contrast. Birds that contrast against a wooded background can easily be lost to the difference in contrast of the wooded branches that may also be moving in the wind. [/QUOTE]
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AF Area Mode
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